the obama administration is warning assad we in america are watching his every move, especially when it comes to these chemical weapons. >> the president made it clear the use of chemical weapons was a red line. we are monitoring the regime's chemical weapons stockpiles. i won't get into intelligence matters. but with the regime's grip on the power loosening with its failure to put count opposition to conventional means, we have an increased concern about the possibility about the regime taking the desperate act of using chemical weapons. >> reporter: senior obama administration officials confirmed to fox news that for loyal to bashar al-asaad have been observed moving around the regime's to be piles of chemical weapons. though to what degree and what ultimate purpose those things remain unknown at this point. the movement of the weapons components at several dozen known sites was first reported in the "new york times." they harbor concerns about possible preparation for use of chemical weapons but sources say they don't know if they noon use them. seen or officials have spoken publi